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pH recording through a computer

Sir,

 

I am interested in obtaining the pH reading to be recorded in the computer.

I have tried using DAQ 6211, but all I could get is a huge noisy signal.

but when I connect it to a CRO or DMM, I could get the required.

 

Could you please help me out with this.

 

Do I require a preamp to get what I need. If so, please could you suggest me?

or does a differential pH electrode do the work for me?

 

Thank you,

Noel

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Noel,

 

A typical pH electrode has a very high source impedance.  A preamplifier designed to work with pH electrodes is probably the best approach.

 

Lynn

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